title: Differentiation of Australian isolates of Mycobacterium paratuberculosis using pulsed-field gel electrophoresis.
abstract: OBJECTIVE
  To examine strain variation amongst Australian isolates of Mycobacterium paratuberculosis.
  
  
  METHODS
  Pulsed field gel electrophoresis was optimised for differentiation of M paratuberculosis strains, and this typing technique was then applied to a collection of Australian isolates.
  
  
  METHODS
  DNAs from 35 Australian isolates of M paratuberculosis and a UK reference strain were digested with one or other of three restriction endonucleases. The banding patterns obtained after pulsed field gel electrophoresis of the DNA fragments were compared.
  
  
  RESULTS
  The Australian isolates were divided into two groups on the basis of their DNA banding pattern. Both were different from the UK reference strain. Seven isolates from cattle in Victoria and the Northern Territory had the same pattern as five isolates from alpacas in Victoria and Western Australia. Another 20 isolates from cattle in Victoria, Western Australia and the Northern Territory had the same pattern as isolates from two sheep and a goat in New South Wales.
  
  
  CONCLUSIONS
  Pulsed field gel electrophoresis was a useful tool for strain typing of M paratuberculosis, and could be used to study the transmission of strains in Australia.
authors.affiliation: Division of Veterinary and Biomedical Sciences, Murdoch University, Western Australia.
authors.forename: M M
authors.initials: MM
authors.lastname: Feizabadi
authors.forename: I D
authors.initials: ID
authors.lastname: Robertson
authors.forename: A
authors.initials: A
authors.lastname: Hope
authors.forename: D V
authors.initials: DV
authors.lastname: Cousins
authors.forename: D J
authors.initials: DJ
authors.lastname: Hampson
mesh_terms: D000818:Animals; D001315:Australia / Q000453:epidemiology; D015373:Bacterial Typing Techniques / Q000662:veterinary*; D002161:Camelids, New World; D002417:Cattle; D002418:Cattle Diseases / Q000453:epidemiology / Q000382:microbiology / Q000635:transmission; D004269:DNA, Bacterial / Q000032:analysis* / Q000737:chemistry / Q000235:genetics; D016521:Electrophoresis, Gel, Pulsed-Field / Q000379:methods / Q000662:veterinary*; D015511:Goat Diseases / Q000453:epidemiology / Q000382:microbiology / Q000635:transmission; D006041:Goats; D016927:Mycobacterium avium subsp. paratuberculosis / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification; D010283:Paratuberculosis / Q000453:epidemiology / Q000382:microbiology / Q000635:transmission; D012756:Sheep; D012757:Sheep Diseases / Q000453:epidemiology / Q000382:microbiology / Q000635:transmission
chemical_list: D004269:DNA, Bacterial